GRE120Motor Protection and Controlfor MV Systems

GRE120

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FEATURES Overcurrent protection for phase and earth

faults (50, 50N, 51, 51N). Dependent and independent time

characteristics (IDMTL and DTL). Programmable reset characteristics. Sensitive earth fault protection (50/51N). Phase undercurrent protection (37). Restricted earth fault protection. Thermal overload protection (49). Start protection(48). Stalled motor protection(50S). Locked rotor protection(51LR). Restart inhibit(66). Negative phase sequence overcurrent

protection (46). Broken conductor detection (46BC). Circuit breaker fail protection (50BF). Inrush current detector. Cold load pick-up feature. Local/Remote control Two settings groups. Combined 1A / 5A current inputs Configurable binary inputs and outputs. Circuit breaker condition monitoring. Trip circuit supervision scheme using two

binary inputs for high integrity (74TC). Automatic self-supervision. Menu-based HMI system. Configurable LED indication. Motor status LED indication. Metering and recording functions. Front mounted USB port for local PC

communications. Rear mounted RS485 serial port for remote

communications. The Modbus protocol is provided for

communication with substation control and automation systems.

APPLICATION

GRE120 is a range of fully numerical multi-function protection relays designed for motor protection applications in medium voltage networks. The devices provide a comprehensive range of protection and control functions within a compact and cost-effective package.

There are two models within the GRE120 range which differ depending on the application and each model has different types according to the number of binary inputs and outputs fitted, see Table 1. Combined 1A/5A current inputs and wide auxiliary supply ranges simplify type selection.

Table 1 - GRE120 Models

Model Configuration

400: GRE120-400GRE120-401

Three Phase Fault and Earth Fault 2 x BIs and 4 x BOs 6 x BIs and 4 x BOs

420: GRE120-420GRE120-421

Three Phase Fault, Earth Fault and Sensitive Earth Fault 2 x BIs and 4 x BOs 6 x BIs and 4 x BOs

All models include multiple, high accuracy motor protection elements such as thermal protection based on IEC 60255-8, motor status monitoring, locked rotor protection, restart inhibit and temperature calculation on current basis. A comprehensive range of additional protection functions are also supported, including overcurrent protection elements (for phase and/or earth fault) with inverse time and definite time delay functions, in accordance with the IEC 60255-151 functional standard, negative sequence overcurrent protection and a broken conductor detection feature. Control functions such as two-step operation of circuit breakers are also provided. The overcurrent protection characteristics change with motor status (start-up / running).

All models provide continuous monitoring of internal circuits and of software. A trip circuit supervision function using two binary inputs provides high-integrity monitoring of the circuit breaker tripping circuit in both the breaker open and closed conditions. Circuit breaker condition monitoring functions provide guidance of maintenance timing.

A user-friendly HMI is provided through a backlit LCD, programmable LEDs, keypad and menu-based operating system. PC access is also provided, either for local connection via a front-mounted USB port, or for remote connection via a rear-mounted RS485 port. The communication system allows the user to read and modify the relay settings, and to access data gathered

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by the relay’s metering and recording functions.

Data available either via the relay HMI or communications ports includes the following functions.

Metering Fault recording Event recording Disturbance recording

(available via communications ports) Table 2 - GRE120 Features

GRE120 - Model Number

400 420

Phase Fault O/C (50/51P)

Earth Fault O/C (50/51N)

SEF (50/51N)

Phase Undercurrent (37)

Thermal Overload (49)

Start Protection (48)

Stalled motor Protection (50S)

Locked Rotor Protection (51LR)

Restart Inhibit (66)

NPS Overcurrent (46)

Broken Conductor (46BC)

Circuit Breaker Fail (50BF)

Inrush Current Detector

Cold Load Protection

Local/Remote Control

Trip circuit supervision (74TC)

Self supervision

CB State Monitoring

Motor Status Monitoring

Trip Counter Alarm

∑Iy Alarm

CB Operate Time Alarm

Two settings groups

Metering

Fault records

Event records

Disturbance records

Modbus Communication

PROTECTION FUNCTIONS

Phase Fault Overcurrent Protection The GRE120 provides three phase overcurrent protection and four independent overcurrent thresholds. The first thresholds (ROC1) may be set for inverse time or definite time operation on motor running. If inverse time is selected, then any one of nine curves may be chosen, including IEC and IEEE/ ANSI standard characteristics, (see Figure 1). The second threshold (ROC2) may be set for definit time on running. The third threshold (SOC) may be set for definite time, or instantaneous operation on start-up. The fourth threshold (ALOC) may be set for definite time, or instantaneous operation for overcurrent alarm.

The first threshold has a programmable reset feature, selectable for instantaneous, definite time or dependent time reset. This feature can be used to protect against flashing fault conditions, or to grade correctly with electromechanical overcurrent relays.

All elements can be inhibited by binary input signals for operation in blocked overcurrent and busbar blocking protection schemes.

Earth Fault Protection The standard earth fault protection is available in all models, and provides four independent overcurrent thresholds. The first and second thresh hold is same as ROC1 protection function, the other threshold are same as SOC protection function, only with more sensitive current thresholds. They are not concerned with motor status (running or start-up).

For model GRE120-400, the earth fault quantity is measured directly, either by connecting the input in the residual circuit of the phase CTs, or, as is recommended for more sensitive settings, using a dedicated core balance earth fault CT. For model GRE120-420, the standard earth fault quantity is derived internally from the residual sum of the three phases.

Sensitive Earth Fault Protection (SEF) GRE120-420 provides 4-stage earth fault protection with more sensitive settings for use in applications where the fault current magnitude may be very low. A 2-stage overcurrent function is provided, with the first stage programmable for inverse time or definite time operation. The second stage provides inverse or definite time operation and runs after operation of the first stage. Third and fourth overcurrent thresholds are provided, each with a definite time delay.

The sensitive earth fault element includes a digital filter which rejects all harmonics other than the fundamental power system frequency.

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The sensitive earth fault quantity is measured directly, using a dedicated core balance earth fault CT.

This input can also be used in transformer restricted earth fault applications, by the use of external metrosils and setting resistors.

Phase Undercurrent Protection Protection against loss of load is provided by the phase undercurrent protection. Two independent thresholds are provided, each with a programmable definite time delay.

Thermal Overload Protection The thermal overload feature provides protection for the stator of motor against the effects of prolonged operation under excess load conditions. A thermal replica algorithm is applied to create a model for the thermal characteristics of the protected plant. Tripping times depend not only on the level of overload current, but also on the level of prior load current, the thermal replica providing ‘memory’ of previous conditions.

The thermal characteristics of the system are defined by entering settings for full load current and thermal time constant. The GRE120 issues a trip according to the ‘cold’ and ‘hot’ curves specified in IEC60255-8 (see Figure 2), to prevent the protected system from exceeding its thermal capacity. The cold curve tripping times are applicable when the system is first energised, while the hot curves are relevant when the system has already been carrying some prior load for a period of time. An alarm output is also available to give early warning of high load current, set as a percentage of thermal capacity.

Start Protection The start protection can be protection for motor failure on start up. When the start-up time exceeds setting time, it detects as a motor failure.

Stalled Motor Protection The stalled motor protection can be detected the restraint rotor on start-up. The restraint rotor on start-up can be detected input signal from tachometer and the overcurrent.

Locked Rotor Protection GRE120 provided a the locked rotor protection on motor running. Burnout of the motor can be protected by the rotor temperature prediction based on stator temperature prediction of IEC60255-8 and detection of current value.

Restart Inhibit The restart Inhibit provides protection of motor burnout by start-up current. From temperature prediction of rotor and the temperature rise prediction by start-up current, when the exceeding rotor permissible temperature by start-up current, the restart inhibit function forbids motor restart.

Negative Phase Sequence Overcurrent Protection (NPS) NPS protection can be used in applications where certain fault conditions may not be detected by the normal phase and earth overcurrent protections, for example, in the case of a relay applied on the delta side of a delta-star transformer, to detect an earth fault on the star side. Alternatively, NPS can be used to protect a three phase motor against the severe overheating which results from operating with an unbalanced supply.

Two independent thresholds are provided, each with a programmable definite time delay.

Broken Conductor Protection The unbalance condition caused by an open circuited conductor is detected by the broken conductor protection. An unbalance threshold with programmable definite time delay is provided.

Inrush Current Detector GRE120 provides an inrush current detector against magnetizing inrush currents. The inrush current detector detects the ratio between second harmonic current and fundamental current.

Circuit Breaker Fail Protection (CBF) Two stage CBF protection provides outputs for re-tripping of the local circuit breaker and/or back-tripping to upstream circuit breakers. The CBF functions can also be initiated by external protections via a binary input if required.

Cold Load Protection The cold load function modifies the overcurrent protection settings for a period after energising the system as a transformer. This feature is used to prevent unwanted protection operation when closing on to the type of load which takes a high level of current for a period after energisation. This is achieved by a ‘Cold Load Settings Group’ in which the user can programme alternative settings. Normally the user will choose higher current settings and/or longer time delays and/or disable elements altogether within this group.

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CONTROL FUNCTIONS

Switchgear Control The GRE120 provides the facility for switchgear control on the relay front panel. Two-stepped operation (select-control) is applied for the control procedure of circuit breakers to ensure highly secure operation. An interlock check function is included for safe operation of the switchgear. Password protection is provided for the above functions.

A local/remote selector switch is also provided on the relay front panel so that remote control from station level or load dispatching centre can be chosen.

Equipment status (Open or Closed) is indicated on front LEDs and relay fascia LCD.

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Figure 1 - Operate and Reset Characteristics in accordance with IEC 60255-151

Inverse Time Operate and Reset Curves (to IEC 60255-151)

IEC/UK Inverse Curves(Time Muliplier TMS = 1)

0.1

1

10

100

1000

1 10 100Current (Multiple of Setting)

Ope

ratin

g Ti

me

(s)

LTI

NI

VI

EI

IEEE/US Inverse Curves(Time Multiplier TM S = 1)

0.1

1

10

100

1 10 100Current (Multiple of Setting)

Ope

ratin

g Ti

me

(s)

MI

VI

STI

I

EI

IEEE/US Reset Curves(Time Multiplier TMS = 1)

1.00

10.00

100.00

1000.00

0.1 1Current (Multiple of Setting)

Tim

e (s

)

MI

VI

EI

STI

I

( ) ⎪⎭

⎪⎬

⎫

⎪⎩

⎪⎨

⎧+

⎥⎥⎥

⎦

⎤

⎢⎢⎢

⎣

⎡

−×= c

GsG

kTMSGt1

)( α

⎥⎥⎥⎥

⎦

⎤

⎢⎢⎢⎢

⎣

⎡

⎟⎠⎞⎜

⎝⎛−

×= 2

1)(

S

rr

GG

tRTMSGt

Inverse time operate function Dependent time reset function

Constants for dependent time curves

Curve Type (IEC 60255-151)

Curve Description k α C tr

A IEC Normal Inverse (NI) 0.14 0.02 0 - B IEC Very Inverse (VI) 13.5 1 0 - C IEC Extremely Inverse (EI) 80 2 0 - D IEEE Moderately Inverse (MI) 0.0515 0.02 0.114 4.85 E IEEE Very Inverse (VI) 19.61 2 0.491 21.6 F IEEE Extremely Inverse (EI) 28.2 2 0.1217 29.1 - UK Long Time Inverse (LTI) 120 1 0 - - US CO8 Inverse (I) 5.95 2 0.18 5.95 - US CO2 Short Time Inverse (STI) 0.02394 0.02 0.01694 2.261

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Figure 2 - Thermal Characteristics in accordance with IEC 60255-8

Thermal Characteristics (to IEC 60255-8)

Thermal Curves (Cold Curve -no prior load)

0.01

0.1

1

10

100

1000

1 10

Overload Current (Multiple of k.IFLC)

Ope

rate

Tim

e (m

inut

es)

τ=1

τ=2

τ=5

τ=10

τ=20

τ=50

τ=100

Thermal Curves (Hot Curve -90% prior load)

0.001

0.01

0.1

1

10

100

1000

1 10

Overload Current (Multiple of k.IFLC)

Ope

rate

Tim

e (m

inut

es)

τ=100

τ=50

τ=20

τ=10

τ=5

τ=2

τ=1

( ) ⎥⎦

⎤⎢⎣

⎡

−= 22

2

..

FLCIkIILnt τ ;

( ) ⎥⎦

⎤⎢⎣

⎡

−−

= 22

22

..

FLC

P

IkIIILnt τ

IEC 60255-8 ‘Cold’ Curve IEC 60255-8 ‘Hot’ Curve

t = time to trip for constant overload current I (seconds)

I = overload current (largest phase current) (pu)

IP = previous load current (pu)

k.IFLC (or Iθ) = thermal overload current setting (pu)

τ = thermal time constant (seconds)

Ln = natural logarithm

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MONITORING FUNCTIONS

Trip Circuit Supervision GRE120 provides a high-integrity trip circuit supervision scheme. Trip circuits can be monitored with the circuit breaker either closed or open using two binary inputs as shown in Figure 3.

Figure 3 – Trip Circuit Supervision Scheme CB Closed: Under healthy conditions, binary input BI1 is energised via external resistor, R1. If the trip circuit becomes open, BI1 resets and a Trip Circuit Fail alarm is raised. CB Open: Under healthy conditions, binary inputs BI1 & BI2 are energised via external resistors, R1 & R2 respectively. If the trip circuit becomes open, both inputs reset and a Trip Circuit Fail alarm is raised. The Trip Circuit Fail alarm incorporates a time delay of 400ms to prevent false alarms during normal tripping operations or voltage dips and is given in the form of an output contact operation and LCD/LED indication.

Automatic Self-Supervision Automatic monitoring of internal circuits and software is provided. In the event of a failure being detected, the ALARM LED or the RELAY FAIL on the relay front panel is illuminated, the ‘RELAY FAILURE’ binary output operates, and the date and time of the failure is recorded in the event record.

Circuit Breaker State Monitoring If two binary inputs are programmed to the functions ‘CB OPEN’ and ‘CB CLOSED’ then the CB State Monitoring function becomes active. In normal circumstances these inputs are in opposite states. If both show the same state then a ‘CB Defective’ alarm is raised.

Circuit Breaker Condition Monitoring The following CB condition monitoring functions are provided:

The trip counter increments the number of tripping operations performed. An alarm is issued when the count exceeds a user-defined setting.

The ∑ Iy counter increments the value of current to the power ‘y’, recorded at the time of issuing the tripping signal, on a phase by phase basis. An alarm is issued when the count for any phase exceeds a user-defined setting.

The operating time monitor records the time between issuing the tripping signal and the phase currents falling to zero. An alarm is issued when the operate time for any phase exceeds a user-defined setting.

The CB condition monitoring functions are triggered each time a trip is issued, and they can also be triggered by an external device via a binary input.

Motor status Monitoring Motor statuses stopped, start-up and running are monitoring from Motor Status LED. Motor status LED is indicated light off is motor stopped, flicker is start-up and light on is running.

METERING AND RECORDING

Metering The following data is continuously available on the relay front panel LCD and at a local or remote PC.

Primary and secondary currents for each input. Positive and negative phase sequence

currents. Ratio of negative phase sequence to positive

phase sequence currents. Peak phase current demand. Thermal condition of stator. Thermal condition of rotor. Motor running time. Start-up time of the last motor start-up. Maximum current during the last motor start-up. Number of start-ups (total, cold and hot starts). Relay element output status. Binary input and output status.

Event Record Records are stored for the 200 most recent events, time-tagged to 1ms resolution. The event record is available on the relay front panel LCD and at a local or remote PC. Events are recorded as follows:

Tripping operations. Alarms. Operation of protection elements.

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Change of state of binary inputs / outputs. Change of relay setting. Failure detected by automatic supervision.

Fault Record A relay trip initiates fault recording. Records are stored for the 4 most recent faults, time-tagged to 1ms resolution. The fault record is available on the relay front panel LCD and at a local or remote PC. Fault records include the following data:

Date and time of trip operation. Operating phase. Protection scheme responsible for trip. Measured current data.

Disturbance Record The relay can record 8 analog and 32 binary signals, initiated by relay tripping. The post-trigger recording time can be set, and the maximum number of records which can be stored is dependent on the recording time chosen.

Date and Time GRE120 provides a date and time feature for tagging of records.

USER INTERFACE

Relay Front Panel A user friendly interface is provided on the relay front panel. A menu-based system provides for easy programming of relay functions and access to real-time and stored data. The front panel includes the following features.

16 character, 8-line LCD with backlight. 14 LEDs (9 fixed display and 5 configurable). Keypad. USB2.0 port for connection of local PC.

Local PC Connection The user can communicate with the GRE120 from a local PC via the USB2.0 port on the front panel. Using RSM100 software, the user can view and modify settings, monitor real-time metering and analyse recorded data.

Figure 4 shows the configuration of typical displays from the RSM100 software.

Modbus RTU Communications GRE120 supports the Modbus RTU communication protocol. This protocol is used for communication with a substation control and monitoring system or automation system to be linked with SCADA or regional control center, and is used to transfer measurand data, status data and general commands between the relay and the control system.

Relay Setting The user can modify relay settings either using the front panel keypad or using the RSM100 software from a local or remote PC. Password protection is available for added security.

Two settings groups are provided, allowing the user to set one group for normal conditions, while the other group may be set to cover alternative operating conditions.

Using the RSM software, the user can create a settings file on a PC (without being connected to a relay), and store the file ready for download to a relay at a later date.

Binary Outputs GRE120 provides four user programmable binary output contacts for tripping and alarm. Each of the programmable binary outputs is driven via a logic gate which can be programmed for OR gate or AND gate operation. Further, each output has a programmable reset characteristic, settable for instantaneous drop-off, delayed drop-off, or for latching operation. If latching operation is selected then an operated relay must be reset by the user, either by pressing the RESET button, by energising a binary input which has been programmed for ‘Remote Reset’ operation, or by a communications command.

Binary Inputs GRE120 provides two programmable binary inputs as standard and a further four available as an option. Each binary input is individually user-programmable for normal or inverted operation and for delayed pick-up and/or drop-off. Each input can also be used to switch relay operation to a different settings group.

General purpose alarm functions are also included. The user can define a text message for each alarm. Then when inputs associated with that alarm are raised, the defined text is displayed on the LCD.

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Figure 4 - Relay Setting and Monitoring System - PC Displays

PC DISPLAY

Setting Event record

Metering Data analysis

Fault record

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TECHNICAL DATA

Ratings

AC current In: 1/5A (combined) Frequency: 50/60Hz Auxiliary supply: 110-250Vdc or 100-220Vac (Operative range: 88–300Vdc /

80–264Vac) 24-48Vdc (Operative range: 19.2 – 57.6Vdc)

Superimposed AC ripple on DC supply: maximum 12% DC supply interruption: maximum 50ms at 110V Binary input circuit DC voltage: For alarm indication

110-250Vdc (Operative range: 88 - 300Vdc) 24-48Vdc (Operative range: 19.2 – 57.6Vdc)

For trip circuit supervision Operative range: ≥38.4V (for 110Vdc rating)

≥88V (for 220/250Vdc rating) ≥19.2V (for 48Vdc rating) ≥9.6V (for 24Vdc rating)

Overload Ratings

AC current inputs:

3 times rated current continuous 100 times rated current for 1 second

Burden

AC phase current inputs: ≤ 0.2VA AC earth current inputs: ≤ 0.4VA AC sensitive earth inputs: ≤ 1.2VA DC power supply: ≤ 10W (quiescent)

≤ 15W (maximum) Binary input circuit: ≤ 0.5W per input at 220Vdc Current Transformer Requirements

Phase Inputs Typically 5P20 with rated burden according to load, (refer to manual for detailed instructions).

Standard Earth Inputs: Core balance CT or residual connection of phase CTs. Sensitive Earth Inputs: Core balance CT. Phase Overcurrent Protection (50, 51)

ROC1 Overcurrent threshold: OFF, 0.10 – 25.00A in 0.01A steps Delay type: DTL, IEC NI, IEC VI, IEC EI, UK LTI, IEEE MI,

IEEE VI, IEEE EI, US CO8 I, US CO2 STI IDMTL Time Multiplier Setting TMS: 0.010 – 1.500 in 0.001 steps DTL delay: 0.00 - 300.00s in 0.01s steps Reset Type: Definite Time or Dependent Time. Reset Definite Delay: 0.0 – 300.0s in 0.1s steps Reset Time Multiplier Setting RTMS: 0.010 – 1.500 in 0.001 steps ROC2 Overcurrent threshold: OFF, 0.10 – 25.00A in 0.01A steps DTL delay: 0.00 - 300.00s in 0.01s steps SOC, ALOC Overcurrent thresholds: OFF, 0.10 - 250.00A in 0.01A steps DTL delay: 0.00 - 300.00s in 0.01s steps

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Earth Fault Protection (50N, 51N)

ROC1 Overcurrent threshold: OFF, 0.05 – 25.00A in 0.01A steps Delay type: DTL, IEC NI, IEC VI, IEC EI, UK LTI, IEEE MI,

IEEE VI, IEEE EI, US CO8 I, US CO2 STI IDMTL Time Multiplier Setting TMS: 0.010 - 1.500 in 0.001 steps DTL delay: 0.00 – 300.00s in 0.01s steps Reset Type: Definite Time or Dependent Time Reset Definite. Delay: 0.0 - 300.0s in 0.1s steps Reset Time Multiplier Setting RTMS: 0.010 – 1.500 in 0.001 steps 3rd, 4th thresholds: OFF, 0.05 – 250.00A in 0.01A steps DTL delay: 0.00 – 300.00s in 0.01s steps Sensitive Earth Fault Protection (50Ns, 51Ns)

1st, 2nd Overcurrent threshold: OFF, 0.002 - 1.000A in 0.001A steps Delay Type: DTL, IEC NI, IEC VI, IEC EI, UK LTI, IEEE MI,

IEEE VI, IEEE EI, US CO8 I, US CO2 STI Stage 1 TMS: 0.010 - 1.500 in 0.001 steps Stage 1 DTL delay: 0.00 - 300.00s in 0.01s steps Stage 1 Reset Type: Definite Time or Dependent Time Stage 1 Reset Def. Delay: 0.0 - 300.0s in 0.1s steps Stage 1 RTMS: 0.010 - 1.500 in 0.001 steps Stage 2 DTL delay: 0.00 - 300.00s in 0.01s steps 3rd, 4th thresholds: OFF, 0.004 - 5.000A in 0.001A steps DTL delay: 0.00 - 300.00s in 0.01s steps Phase Undercurrent Protection (37)

1st, 2nd threshold: OFF, 0.10 – 10.00A in 0.01A steps DTL delay: 0.00 - 300.00s in 0.01s steps Thermal Overload Protection (49)

Iθ = k.IFLC (Thermal setting): OFF, 0.40 - 10.00A in 0.01A steps Time constant (τ): 0.5 - 500.0mins in 0.1min steps Thermal alarm: OFF, 50% to 99% in 1% steps Start Protection (48) Motor start protection time: 0.0 - 300.0s in 0.1s steps Stalled Motor Protection (50S) 50S threshold: OFF, 0.10 - 50.00A in 0.01A steps DTL delay: 0.00 - 300.00s in 0.01s steps Locked Rotor Protection (51LR)

Motor start-up current: OFF, 0.10 – 100.00A in 0.01A steps Rotor restraint permissible time: 1 – 300s in 1s steps Rotor permissible heat range:

the ratio from THM1 (stator) 50 – 500% in 1% steps

Restart Inhibit (66)

Motor start-up time: 1 – 300s in 1s steps Rotor restraint permissible time: 1 – 300s in 1s steps (Common setting as 51LR) Rotor permissible heat range:

the ratio from THM1 (stator) 50 – 500% in 1% steps (Common setting as 51LR)

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Negative Phase Sequence Protection (46)

1st, 2nd threshold: OFF, 0.10 - 10.00A in 0.01A steps DTL delay: 0.00 - 300.00s in 0.01s steps Broken Conductor Protection (46BC)

Broken conductor threshold (I2/I1): OFF, 0.10 - 1.00 in 0.01 steps DTL delay: 0.00 - 300.00s in 0.01s steps Inrush Current Detector Second harmonic ratio setting (I2f/I1f): 10 – 50% in 1% steps Overcurrent thresholds: 1.00 – 25.00A in 0.01A steps CBF Protection (50BF)

CBF threshold: OFF, 0.10 - 10.00A in 0.01A steps CBF stage 1 DTL: 0.00 - 300.00s in 0.01s steps CBF stage 2 DTL: 0.00 - 300.00s in 0.01s steps

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Accuracy

IDMTL Overcurrent Pick-up: 105% of setting ± 5% All Other Overcurrent Pick-ups: 100% of setting ± 5% Overcurrent PU/DO ratio: ≥95% Undercurrent Pick-up: 100% of setting ± 5% Undercurrent PU/DO ratio: ≤105% Inverse Time Delays: IEC60255-151, ±5% or 50ms (2 ≤ G/Gs ≤ 20)

GT = 1.1Gs GD = 20Gs (Gs ≤ 10A) 200A (Gs > 10A)

Definite Time Delays: ± 1% or 10ms Transient Overreach for instantaneous elements:

<5%

Front Communication port - local PC (USB2.0)

Connector type: Type B Cable length: 5m (max.) Rear Communication port - remote PC (RS485)

Connection: Multidrop (max. 32 relays) Cable type: Twisted pair Cable length: 1200m (max.) Connector: Screw terminals Isolation: 1kVac for 1 min. Transmission rate: 19.2 kbps for Modbus RTU Binary Inputs

Operating Voltage For alarm indication Typical 154Vdc (min. 110Vdc) for 220Vdc rating Typical 77Vdc (min. 70Vdc) for 110Vdc rating Typical 33.6Vdc (min. 24Vdc) for 48Vdc rating Typical 16.8Vdc(min. 12Vdc) for 24Vdc rating

For trip circuit supervision ≥88V for 220/250Vdc rating ≥38.4Vdc for 110Vdc rating ≥19.2V for 48Vdc rating ≥9.6V for 24Vdc rating

Binary Outputs

Number 4 (excluding Relay Fail contact) Ratings (for BO#1 and BO#2): (for other BOs)

Make and carry: 5A continuously Make and carry: 30A, 250Vdc for 0.5s (L/R≥40ms) Break: 0.1A, 250Vdc (L/R=40ms) Make and carry: 4A continuously Make and carry: 8A, 250Vdc for 0.2s (L/R≥40ms) Break: 0.1A, 250Vdc (L/R=40ms)

Durability: Pickup time: Reset time:

Loaded contact: ≥1,000 operations Unloaded contact: ≥10,000 operations Less than 15ms Less than 10ms

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Mechanical design

Weight 1.5kg Case color Munsell No. 10YR8/0.5 Installation Flush mounting or Semi-flush mounting or Surface mounting

with attachment kits

ENVIRONMENTAL PERFORMANCE

Test Standards Details

Atmospheric Environment

Temperature IEC 60068-2-1/2 IEC 60068-2-30

Operating range: -20°C to +60°C. Storage / Transit: -25°C to +70°C.

Humidity IEC 60068-2-78 56 days at 40°C and 93% relative humidity. Enclosure Protection IEC 60529 IP52 (front), IP20 (rear), IP40 (top)

Mechanical Environment

Vibration IEC 60255-21-1 Response - Class 1 Endurance - Class 1

Shock and Bump IEC 60255-21-2 Shock Response Class 1 Shock Withstand Class 1 Bump Class 1

Seismic IEC 60255-21-3 Class 1

Electrical Environment

Dielectric Withstand IEC 60255-5 IEEE C37.90.0

2kVrms for 1 minute between all terminals and earth. 2kVrms for 1 minute between independent circuits. 1kVrms for 1 minute across normally open contacts.

High Voltage Impulse IEC 60255-5 Three positive and three negative impulses of 5kV(peak) for CT, Power Supply Unit (PSU), BI and BO circuits; between terminals and earth, and between independent circuits 3kV (peak) for RS485 circuit; between terminals and earth 3kV (peak) for BO circuit; across normally open contacts

1.2/50µs, 0.5J between all terminals and between all terminals and earth.

Electromagnetic Environment

High Frequency Disturbance / Damped Oscillatory Wave

IEC 60255-22-1 Class 3, IEC 61000-4-12 IEEE C37.90.1

1MHz 2.5kV to 3kV (peak) applied to all ports in common mode. 1MHz 1.0kV applied to all ports in differential mode.

Electrostatic Discharge

IEC 60255-22-2 Class 3, IEC 61000-4-2

6kV contact discharge, 8kV air discharge.

Radiated RF Electromagnetic Disturbance

IEC 60255-22-3 Class 3, IEC 61000-4-3

Field strength 10V/m for frequency sweeps of 80MHz to 1GHz and 1.7GHz to 2.2GHz. Additional spot tests at 80, 160, 450, 900 and 1890MHz.

Fast Transient Disturbance

IEC 60255-22-4 Class A, IEC 61000-4-4, IEEE C37.90.1

4kV, 2.5kHz, 5/50ns applied to all inputs.

Surge Immunity IEC 60255-22-5, IEC 61000-4-5

1.2/50µs surge in common/differential modes: HV, PSU and I/O ports: 2kV/1kV (peak) RS485 port: 1kV (peak)

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Test Standards Details

Conducted RF Electromagnetic Disturbance

IEC 60255-22-6 Class 3, IEC 61000-4-6

10Vrms applied over frequency range 150kHz to 100MHz. Additional spot tests at 27 and 68MHz.

Power Frequency Disturbance

IEC 60255-22-7 Class A, IEC 61000-4-16

300V 50Hz for 10s applied to ports in common mode. 150V 50Hz for 10s applied to ports in differential mode. Not applicable to AC inputs.

Conducted and Radiated Emissions

IEC 60255-25, EN 55022 Class A, IEC 61000-6-4

Conducted emissions: 0.15 to 0.50MHz: <79dB (peak) or <66dB (mean) 0.50 to 30MHz: <73dB (peak) or <60dB (mean) Radiated emissions (at 10m): 30 to 230MHz: <40dB 230 to 1000MHz: <47dB

European Commission Directives

89/336/EEC Compliance with the European Commission Electromagnetic Compatibility Directive is demonstrated according to generic EMC standards EN 61000-6-2 and EN 61000-6-4.

73/23/EEC Compliance with the European Commission Low Voltage Directive is demonstrated according to product safety standard EN 60255-27.

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ORDERING

Motor Protection Relay

Type: Motor Protection Relay GRE120Model: - Model 400: Three phase and earth fault 2 x BIs, 4 x Bos, 1 x Relay fail 6 x BIs, 4 x BOs, 1 x Relay fail

400 401

- Model 420: Three phase, earth and sensitive earth fault

2 x BIs, 4 x BOs, 1 x Relay fail 6 x BIs, 4 x BOs, 1 x Relay fail

420 421

Rating: CT: 1/5A, f: 50/60Hz, 110/250Vdc or 110/240Vac CT: 1/5A, f: 50/60Hz, 24/48Vdc

1 A

Standard and language: IEC (English) 0 Communication: RS485 (Modbus) 1

GRE120 A 0

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TYPICAL APPLICATIONS / CONNECTIONS

*BO3 and BO4 are NOT applicable for direct CB coil connection.

Figure 5 - GRE120-400A Typical Application Diagram

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*BO3 and BO4 are NOT applicable for direct CB coil connection.

Figure 6 - GRE120-401A Typical Application Diagram

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*BO3 and BO4 are NOT applicable for direct CB coil connection.

Figure 7 - GRE120-420A Typical Application Diagram

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*BO3 and BO4 are NOT applicable for direct CB coil connection.

Figure 8 - GRE120-421A Typical Application Diagram

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RELAY OUTLINE

Figure 7 - GRE120 Outline Diagram

2-M4 screw hole for panel mount jig

MOTOR STATUS

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1-1, Shibaura 1-Chome, Minato-Ku, Tokyo 105-8001, Japan

Tel +81-3-3457-3644 Fax +81-3-5444-9166

http://www.toshiba-relays.com ©C

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- The information given in this catalog is subject to change without notice.

- The information given in this catalog is as of 30 September 2011.- The information given in this catalog is presented only as a guide

for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of TOSHIBA or others.

- TOSHIBA products should not be embedded to the downstream products which are prohibited to be produced and sold, under any law and regulations.